440 spark plugs: Why not Platinums?

[The_Handier_Man1]

From: winnedaygo619  (Original Message)
Sent: 3/18/2005 1:00 AM

hello all i want to change my spark plugs i have a 1976 winne  brave 440 m300
wich are best for my winne thanks every1



From: Liv42dayOK
Sent: 3/18/2005 8:55 AM

There's another Discussion which covers the conversion numbers from the originals for your 440.  Use the Message Search.  NGK is very good, I have the Iridium IX's in mine but, these are really waaaay overkill and expensive for our needs.  Just don't select anything "Platinum". - Sob



From: SeaRaySRV16O
Sent: 5/7/2005 12:58 AM

Just curious SOB,

What kind of problems do platinum plugs cause in an old Dodge? I ran some platinum plugs 100K in my old Escort.

Regards,

Robert Donley
Jenison, MI



From: HeavyHaulTrucker
Sent: 5/7/2005 2:33 AM

The Bosch Platinum plugs are toast when run in an engine that naturally runs a rich mixture, such as the 440.  They perform best in the newer fuel injected cars that -- by design -- run a leaner fuel mixture.

I tried a set in my 440 when I first got it... fuel mileage suffered, and there was a lack of power.  I went back to the stock Champion R12YC spark plugs, and gained 1/2 a mpg and had way more power.

John



From: HeavyHaulTrucker
Sent: 5/8/2005 8:43 PM

Sorry... correct plug number for the 440 is RV12YC Champions, gapped at .035

John



From: steelman_ny
Sent: 6/3/2005 3:36 PM

stay away from platinum?? i was just going to ask if i should use the ones the manual calls for or buy platinum. what is wrong with them??  thanks



From: poppinjohnnies
Sent: 6/3/2005 4:45 PM

I've had the best luck with plain old Autolites.  The Port of Indecision runs great on them and my antique John Deeres love them, too



From: MacD22C
Sent: 9/19/2005 5:41 PM

I have been happy on my 413 with Champion "Truck plugs"  Not sure of the PNs.

John



From: MacD22C
Sent: 9/19/2005 6:09 PM

1972 Dodge M400 chassis w/413 motor uses a Champion 4405 truck plug - try a set, I did :-)


John